Home Variable Frequency Drives Allen-Bradley VFDs MicroLogix 1200 to PowerFlex 4 using Modbus

MicroLogix 1200 to PowerFlex 4 using Modbus

February 9, 2004

This second program is based on the first, but uses the Modbus Master protocol available in the latest release of the MicroLogix 1200, as well as a 1761-Net-AIC.

The biggest obstacle in getting this configuration to work was trying to find the polarity of the comm lines (i.e. does + comm on the AIC go to A or B comm on the drive?) as well as realizing all the modbus addresses are offset by 1 (which even Rockwell Drives Div. missed in Rev 1 of the subsequently release tech note).

Since this file was published, Rockwell has release (and fixed) a tech note, and also has an excellent 2004 HOT LAB.

Requirements:

RSLogix 500 Version: 6.1
Additional Requirements: Micro1200 & PowerFlex 4 /40
File Size: 60 kb
Uploaded on: 02/09/04
Entered By: Shawn Michael Tierney

Download Link:

RSLogix 500 Ladder Micro1200 to PowerFlex 4 using Modbus

Sincerely,

Shawn Tierney
Automation Instructor and Blogger

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Shawn Tierney

Shawn began programming as a pre-teen in the early 80's, and after earning a degree in Electronics he worked as an Automation Specialist for 25 years. In 1999 Shawn launched his first website which was the pre-cursor to TheAutomationBlog.com which he launched in 2013. Today Shawn continues to publish and edit content for The Automation Blog while also teaching PLC, HMI, and SCADA courses at TheAutomationSchool.com.